Hattori Masashige (服部 正重, 1580 - 1652) was an Edo period ninja. His older brother was Hattori Masanari and his younger brother was the monk Hattori Masahiro. His wife was the daughter of Ōkubo Nagayasu. He fought his first battle at 20 years old (Battle of Sekigahara) and went on to fight in the Siege of Osaka after his brothers death at Osaka he succeded him and became leader of the Iga ninja. He went on to serve the Tokugawa after they secured the shogunate.